substanceTest AlumColors & materialsA named craft material / finish lemma (Test Alum) drawn as an exact public-domain workshop phrase.Test Alum is historically related to Salt.mineral-lake-pigments seats orphan test-alum beside salt as a first craft peer — object speech, not a text-container or tradition dump.from Josef Bersch (tr. PD) · The Manufacture of Mineral and Lake Pigments, PD Gutenberg #72143historically related to · sourced · documentedsourcesThe Manufacture of Mineral and Lake Pigments · Josef Bersch (tr. PD)Josef Bersch, The Manufacture of Mineral and Lake Pigments (PD Gutenberg ed.).